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Preparation method of modified attapulgite clay for drilling fluid

A technology of attapulgite clay and drilling fluid, applied in the directions of aluminum silicate, silicate, etc., can solve the problems of low viscosity and high impurity content, and achieve the effect of low filtration loss, good modification effect and small filtration loss.

Inactive Publication Date: 2012-05-30
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, with the reduction of high-quality natural attapulgite clay ore, low-grade attapulgite clay ore often has high impurity content and relatively low viscosity, which cannot meet the actual use requirements.

Method used

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  • Preparation method of modified attapulgite clay for drilling fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] After the attapulgite clay raw ore with a water content of 30wt% is crushed by a crusher, the attapulgite clay is extruded by a pair of rollers to obtain a sheet-shaped attapulgite clay with a thickness of 1 to 2 mm; weigh 100kg of attapulgite clay, add 5kg of magnesium sulfate and mix it in a mixer Uniformly, extrude once on a double-roll machine, beating with a suspension concentration of 5wt%, passing through a 200-mesh sieve, centrifugal dehydration, drying, crushing, and packaging.

Embodiment 2

[0023] After the attapulgite clay raw ore with a water content of 40wt% was crushed by a crusher, it was extruded by a pair of rollers to obtain a sheet-shaped attapulgite clay with a thickness of 1 to 2 mm; 100 kg of attapulgite clay was weighed, and 7.5 kg of magnesia was added to mix evenly. Squeeze 3 times on the roller machine, beating with 7wt% suspension concentration, passing through 200 mesh sieve, centrifugal dehydration, drying, crushing, and packing.

Embodiment 3

[0025] After the attapulgite clay raw ore with a water content of 35wt% is crushed by a crusher, it is extruded by a pair of rollers to obtain a sheet-shaped attapulgite clay with a thickness of 1 to 2 mm; 100 kg of attapulgite clay is weighed, and 2.5 kg of magnesium stearate and 7.5 kg of magnesia is mixed evenly, extruded 5 times on a double roller machine, beaten with a suspension concentration of 10wt%, passed through a 200-mesh sieve, centrifugally dehydrated, dried, pulverized, and packaged.

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Abstract

The invention discloses a preparation method of modified attapulgite clay for drilling fluid. According to the invention, attapulgite clay is used as a raw material and a magnesium-containing substance is used as a modifier. By the adoption of a semi-dry production technology, the preparation method contains the following steps of: crushing clay mineral, adding the modifier for mixing, extruding, pulping, sieving, dehydrating, drying, crushing and packaging. The product provided by the invention can meet requirements of various geological drilling, geothermal drilling and petroleum drilling, and is especially applicable to inland saliferous strata drilling, offshore drilling and ultra-deep drilling.

Description

technical field [0001] The invention relates to a preparation method of modified attapulgite clay for drilling fluid. Background technique [0002] Drilling fluid is not only a means to prevent and solve accidents in wells, but also an important way to improve drilling efficiency and engineering quality. For a long time, bentonite has been an important slurry material for water-based drilling fluids. However, because inorganic salts have a certain inhibitory effect on the hydration and dispersion of bentonite, the slurrying rate of bentonite in brine is low. In addition, the pulping rate of sodium bentonite is generally higher, but the reserves are less, while calcium bentonite needs to be converted into sodium bentonite by adding soda ash before it can be used, and its performance is worse than natural sodium bentonite. With the increase of world energy demand and the development of drilling technology, there are more and more oil and gas drilling in deep wells, ultra-deep...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/26
Inventor 康玉茹王爱勤王文波汪琴
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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